// SPDX-License-Identifier: BSD-3-Clause-Clear
/* Copyright (C) 2025 MediaTek Inc. */

#include <linux/of.h>
#include "mt7921.h"
#include "regd.h"
#include "mcu.h"

static bool mt7921_disable_clc;
module_param_named(disable_clc, mt7921_disable_clc, bool, 0644);
MODULE_PARM_DESC(disable_clc, "disable CLC support");

bool mt7921_regd_clc_supported(struct mt792x_dev *dev)
{
        if (mt7921_disable_clc ||
            mt76_is_usb(&dev->mt76))
                return false;

        return true;
}

static void
mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
{
#define IS_UNII_INVALID(idx, sfreq, efreq) \
        (!(dev->phy.clc_chan_conf & BIT(idx)) && (cfreq) >= (sfreq) && (cfreq) <= (efreq))
        struct ieee80211_supported_band *sband;
        struct mt76_dev *mdev = &dev->mt76;
        struct device_node *np, *band_np;
        struct ieee80211_channel *ch;
        int i, cfreq;

        np = mt76_find_power_limits_node(mdev);

        sband = wiphy->bands[NL80211_BAND_5GHZ];
        band_np = np ? of_get_child_by_name(np, "txpower-5g") : NULL;
        for (i = 0; i < sband->n_channels; i++) {
                ch = &sband->channels[i];
                cfreq = ch->center_freq;

                if (np && (!band_np || !mt76_find_channel_node(band_np, ch))) {
                        ch->flags |= IEEE80211_CHAN_DISABLED;
                        continue;
                }

                /* UNII-4 */
                if (IS_UNII_INVALID(0, 5845, 5925))
                        ch->flags |= IEEE80211_CHAN_DISABLED;
        }

        sband = wiphy->bands[NL80211_BAND_6GHZ];
        if (!sband)
                return;

        band_np = np ? of_get_child_by_name(np, "txpower-6g") : NULL;
        for (i = 0; i < sband->n_channels; i++) {
                ch = &sband->channels[i];
                cfreq = ch->center_freq;

                if (np && (!band_np || !mt76_find_channel_node(band_np, ch))) {
                        ch->flags |= IEEE80211_CHAN_DISABLED;
                        continue;
                }

                /* UNII-5/6/7/8 */
                if (IS_UNII_INVALID(1, 5925, 6425) ||
                    IS_UNII_INVALID(2, 6425, 6525) ||
                    IS_UNII_INVALID(3, 6525, 6875) ||
                    IS_UNII_INVALID(4, 6875, 7125))
                        ch->flags |= IEEE80211_CHAN_DISABLED;
        }
}

int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
                           enum environment_cap country_ie_env)
{
        struct mt76_dev *mdev = &dev->mt76;
        struct ieee80211_hw *hw = mdev->hw;
        struct wiphy *wiphy = hw->wiphy;
        int ret = 0;

        dev->regd_in_progress = true;

        mt792x_mutex_acquire(dev);
        if (!dev->regd_change)
                goto err;

        ret = mt7921_mcu_set_clc(dev, alpha2, country_ie_env);
        if (ret < 0)
                goto err;

        mt7921_regd_channel_update(wiphy, dev);

        ret = mt76_connac_mcu_set_channel_domain(hw->priv);
        if (ret < 0)
                goto err;

        ret = mt7921_set_tx_sar_pwr(hw, NULL);
        if (ret < 0)
                goto err;

err:
        mt792x_mutex_release(dev);
        dev->regd_change = false;
        dev->regd_in_progress = false;
        wake_up(&dev->wait);

        return ret;
}
EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);

void mt7921_regd_notifier(struct wiphy *wiphy,
                          struct regulatory_request *req)
{
        struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
        struct mt792x_dev *dev = mt792x_hw_dev(hw);
        struct mt76_connac_pm *pm = &dev->pm;
        struct mt76_dev *mdev = &dev->mt76;

        if (req->initiator == NL80211_REGDOM_SET_BY_USER &&
            !dev->regd_user)
                dev->regd_user = true;

        /* do not need to update the same country twice */
        if (!memcmp(req->alpha2, mdev->alpha2, 2) &&
            dev->country_ie_env == req->country_ie_env)
                return;

        memcpy(mdev->alpha2, req->alpha2, 2);
        mdev->region = req->dfs_region;
        dev->country_ie_env = req->country_ie_env;

        if (req->initiator == NL80211_REGDOM_SET_BY_USER) {
                if (dev->mt76.alpha2[0] == '0' && dev->mt76.alpha2[1] == '0')
                        wiphy->regulatory_flags &= ~REGULATORY_COUNTRY_IE_IGNORE;
                else
                        wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE;
        }

        dev->regd_change = true;

        if (pm->suspended)
                return;

        mt7921_mcu_regd_update(dev, req->alpha2,
                               req->country_ie_env);
}

static bool
mt7921_regd_is_valid_alpha2(const char *alpha2)
{
        if (!alpha2)
                return false;

        if (alpha2[0] == '0' && alpha2[1] == '0')
                return true;

        if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
                return true;

        return false;
}

int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2)
{
        struct wiphy *wiphy = phy->mt76->hw->wiphy;
        struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
        struct mt792x_dev *dev = mt792x_hw_dev(hw);
        struct mt76_dev *mdev = &dev->mt76;

        if (dev->hw_full_reset)
                return 0;

        if (!mt7921_regd_is_valid_alpha2(alpha2) ||
            !mt7921_regd_clc_supported(dev) ||
            dev->regd_user)
                return -EINVAL;

        if (mdev->alpha2[0] != '0' && mdev->alpha2[1] != '0')
                return 0;

        /* do not need to update the same country twice */
        if (!memcmp(alpha2, mdev->alpha2, 2))
                return 0;

        if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
                return regulatory_hint(wiphy, alpha2);
        else
                return mt7921_mcu_set_clc(dev, alpha2, ENVIRON_INDOOR);
}

int mt7921_regd_init(struct mt792x_phy *phy)
{
        struct wiphy *wiphy = phy->mt76->hw->wiphy;
        struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
        struct mt792x_dev *dev = mt792x_hw_dev(hw);
        struct mt76_dev *mdev = &dev->mt76;

        if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
                wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE |
                                           REGULATORY_DISABLE_BEACON_HINTS;
        else
                memzero_explicit(&mdev->alpha2, sizeof(mdev->alpha2));

        return 0;
}